Electric switch



\NVENTOR C. E. HANNY ELECTRIC SWITCH Filed June 22, 1940 3 Sheets-Sheet 1 U/mrZeSZ. Hang KTTORNEY July 14, 1942.

3 Sheets-Sheet 2 Filed June 22, 1940 dRNEY C. E. HANNY ELECTRIC SWITCH July 14, .1942.

Filed June.22,' 1940 3 Sheets-Sheet 3 M50 TEAL vENTbR .Ji'aJI/Iy Patented'July 14, 1942 ELECTRIC SWITCH Charles E. Hanny, Plainville, Conn., assignor to The Trumbull Electric Manufacturing Company, Plainville, Gonm, a corporation of Connecticut Application June 22,1940, Serial No. 341,814

7 Claims. (Cl. 200-114) My invention relates to electric switches of the so-called fuse-puller type.

One object is to provide a simple, rugged construction in which the fuse carrier contacts are so designed that the carrier may be reversed and inserted in the off. position without the possibillty of closing the circuit or injuring the parts.

'Another object is to provide fuse carriers for the main and branch circuits so constructed with respect to the main holder that they cannot be interchanged. I

Fig. 1 is a front view of one form of construction involving my invention.

Fig. 2 is a vertical sectional view of the same on the. general plane of the line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view on the general plane of the line 3--3 of Fig. 1.

Fig. 4 is a similar sectional view showing one of the fuse carriers inserted in open circuit or of! .position.

Fig. 5 is a front view of the insulating support or body for receiving the fuse carriers.

Fig. 6 is a perspective view of the main circuit fuse carrier.

Fig. 7 is a perspective view taken from the rear of the branch circuit fuse carrier.

Figs. 8 and 9 are diagrammatic views showing typical circuit connections and indicating in dotted lines the relatively small and large openings leading to the plug-in contacts.

The current carrying parts and the supports for them are enclosed in va suitable receptacle,

for instance one having a. body or box portion Ill and a' cover ll hinged at one edge thereto.

' This cover may be held in place by screws such as l2.

The central part of the cover is provided with a depressed portion l3 which provides a recess which is normally closed by a door l4 hinged at ii to the main cover.

In its preferred form the main features of the invention include an insulating body l6 which may be suitably secured to the base in any suitable manner as for instance by means of lugs i1 and screw l8. This body carries all of the principal conducting portions including the fuse sockets and removable-fuse carriers.

The construction shown provides for the control of the main circuit and the branch circuit for which there is a main fuse carrier 20 and a branch fuse carrier 2|. The electrical connections for these two carriers are alike, but the carriers are so constructed that they are not interehangeable.- For this purpoes it will be noted has opposite corners 23, 23 filled in and the corresponding comers 24 of the carrier are beveled off. In'similar manner the corners 23 of the reces for the fuse carrier 2| are filled in and the corresponding corners 24 of the carrier are bev-' eied ofi. By reason of this construction, it will be seen that it will be impossible to insert carrier 2i in the recess for carrier 20.

As the two carriers and the associated conductors are electrically similar, it will be necessary to describe only one.

' Each of the upper circuit terminals 26 is suitably secured to the base and a spring contact 21 which projects slightly into the passage 28 inthe base. Each of the lower contacts 29 is similarly constructed and projects slightly into a passage 30. In this case, the contact 29 is secured by a central screw 3| which also secures a fuse socket 32 and its terminal 33.

The fuse carrier is provided with contact blades 34, 34 at one end and 35, 35 at the other end. These contact blades are connected to fuse sockets such as 36 and 31, respectively, for supporting cartridge type fuses.

In the fuse shown in Figs. -1 and 2, the carrier 2| is in place in its recess in the base and the blades 34 and 35 engage respectively the contacts 21 and 29 so that the circuit will be closed or on. To open the circuit, it is merely necessary to. pull out the carrier 2i by means of the handle 38.

To leave the switch in the ofi or open circuit position, it is merely necessary to reverse the carrier 2i and insert it with the word oil in the proper position as shown in Fig. 4. In this position, it is impossible for the circuit to be closed because of the fact that the edge of the blades 34, 34 has a flange 39'which cannot be inserted into the passage 30 because the passage '30 is not as wide as passage 28 adjacent the contact 21.

By this simple arrangement and construction,

it is possible to provide means for supporting the that the recess 22 is generally rectangular but it will be seen that the passages 43 for the paswith the live contact 21 even though it mightbe possible to insert the blade 40 into the passage 44 and against the contact 29.

A similar situation in Fig, 8 exists on the right hand side where the contacts 29', 29' are connected by cross conductors 50 to the line wires and 52 so that the contacts 29' are the live contacts of the range side. For this reason the passages 3a in the base are made marrower than passages 28.

Fig. 9 shows a simple diagram where the narrow passage 43 is provided adjacent the live contact 21 and the wider passage 414 is provided adjacent the branch contact 29.

Similarly on the right hand side of Fig. 9 the The reason for pro-' ed toreestablish the circuit, and whereby the cormet position for complete insertion of said block may be easily and rapidly ascertained by inspection ofsaid flanged blades and said larger sized passages.

3. Ina pull type switch having an insulating base carrying at least two separated contacts below one surface of the base and a. separate removable and reversible block carrying at least two cooperating blades in a single circuit, an arrangement for allowing cooperation of the blades with the base contacts to complete a circuit between the contacts in one position of the block and to prevent completion of the circuit in another position of the block, including a flange at the tip of one of the blades, and a cooperating surface on the base above one of the contacts, preventing engagement of the flanged blade with that contact, the base above the other of said contacts being free from contact preventing surfaces, said fiange and said cooperating raised surface affording upon visual and tactile inspection, rapid and easy determination of the relarange circuit includes stationary contacts 29 1 which are connected by cross members 53 and 54 to the respective contacts for the main fuses.

When the main circuit is closed the contacts 29, 29 on the right are-the live contacts in the range circuit and accordingly I provide narrow passages 36, 30 adjacent those contacts 29, 29 to receive the blades 35, 35, which passages are too narrow to receive the blades 34, 34,

The base may be suitably marked on at its top portion and off at its bottom portion to assist in guiding the carrier to desired position.

It will be noted that when a carrier is in either an on or ofi position in its recess, the

switch contacts, fuse clips, fuses and all current carrying parts are inaccessible and shielded against all outside contact.

The improved switch is neat and compact and v is so made and marked that mere reversal of either carrier, top for bottom, gives complete contact or none at all, thus eliminating all guess work and making the switch practically fool proof.

When in the off position, the contact blades such as 34 and 35 and and 4| may resiliently and 'frictionally engage side walls of the chamber so as to prevent the carrier from falling out or rattling.

I claim:

1. A puller type switch including a base with two substantially rectangular recesses for re,-

tive position of said base contacts and said block blades with respect to complete engagement with one another.

4. In a pull type switch having an insulating base carrying a line contact and a load contact below a surface of the base and a separate removable and reversible block carrying at least two blades in a single circuit, an arrangement for allowing cooperation of the blades with the base contacts to complete a circuit between the line and load in one position of the block and to pre:

' vent completion of the circuit in another position of the block, including a flange at the tip of one of the blades and a cooperating surface on the base above the line contact, preventing engagement of the flanged blade with that contact, the base above the load contact being free from any such contact preventing surfaces, whereby the determination of the position in which said flanged blade may engage the load contact is easily accomplished.

5. A puller type switch having an insulating base with protected switch contacts and with a pair of passages of a certain size and another pair of passages of a larger size and a reversible insulating block insertible into the base and hav-.-

ing a pair of line blades and a pair of load blades with flanged portions, said line blades being adapted to be inserted into the pair of smaller ceiving carrier blocks, each block when entirely inserted in one position closing the circuit and when inverted adapted to be inserted substantially in its entirety without reestablishing the circuit, said recesses having corners protruding therein and adapted to be engaged by the cor ners of the block for preventing interchangeability of the blocks in the recesses in closed circuit position. A

2. A puller type switch having an insulating base with protected switch contacts and with a pair of passages of a certain size and another pair of passages of a larger size and a reversible insulating carrier block insertible into the base and having a pair of blades adapted to be inserted into the pair of smaller passages and having another pair .of blades with flanges insertible into passages and said load blades being adapted to be inserted into said larger passages to establish a circuit but being too large to be inserted into said smaller passages whereby the block cannot be inverted and the blades inserted to reestablish the circuit.

6. In a pull type switch having an insulating base carrying a line contact and a load contact below a surface of the base, and a separate removable and reversible block carrying at least two blades in a single circuit, one of said blade: being formed with a flange at its tip, an arrangement for allowing cooperation of the blades with the base contacts to complete a circuit between the line and load in one position of the block and to prevent completion of the circuit in another position of the block including a passage in the base above the line contact and a passage in the base above the load contact, the passage above the line being too small to receive the blade with the flanged tip but sufllciently large to receive the other blade. the passage above the load conhaving cut away corners corresponding to the filled in corners of the second recess, whereby each of said blocks can enter only the respective recess having corresponding corner configurations, but said block can enter said recess in two positions angularly removed'by substantially 180,

each of said blocks carrying contact blades so formed and adapted as to connect the fuses carried by said block to the contacts in the recess when it enters therein at one predetermined angular position only.

CHARLES E. I-IANNY. 

